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1. Imposed as an obligation or duty; obligatory: felt it was incumbent on us all to help.
2. Lying, leaning, or resting on something else: incumbent rock strata.
3. Currently holding a specified office: the incumbent mayor.
A person who holds an office or ecclesiastical benefice: The incumbent was reelected to another term.

[Middle English, holder of an office, from Medieval Latin incumbēns, incumbent-, from Latin, present participle of incumbere, to lean upon, apply oneself to : in-, on; see in-2 + -cumbere, to recline.]

in·cum′bent·ly adv.